Improved systems and processes for high-selectivity conversion of mono-aromatics from olefins

Abstract

The disclosure related to processes for the high-selectivity conversion of olefins to monocyclic aromatic compounds, such as BTX, via the introduction of a weakly coordinating compound to a dehydroaromatization catalyst. Moreover, certain embodiments relate to processes for recycling polyaromatic compounds back to a reactor to improve the yield of said monocyclic aromatic compounds. Moreover, certain embodiments relate to processes for regenerating the dehydroaromatization catalyst.

1 . A process for high-selectivity conversion of a first composition comprising olefins to a second composition comprising at least one monocyclic aromatic compound, comprising the steps of:
 a) introducing the first composition to at least one catalyst capable of converting olefins to at least one monocyclic aromatic compound;   b) operating said process using a reactor at high severity to result in the production of at least one monocyclic aromatic compound; and at least one of:   c) introducing at least one weakly coordinating compound to the catalyst; and c2) forming at least one polyaromatic compound in said process, wherein said at least one polyaromatic compound is recycled to a gasifier or pyrolysis reactor or catalytic reactor.   
     
     
         2 . The process according to  claim 1 , further comprising the step of subjecting the first composition with a nitrogen and/or sulfur atom and/or halogen-containing compound removal process. 
     
     
         3 . (canceled) 
     
     
         4 . The process according to  claim 1 , wherein said at least one catalyst is porous aluminosilicate or zeolitic material with a portion of its pores in the micro-, meso- and/or macro-range. 
     
     
         5 . The process according to  claim 1 , wherein said at least one catalyst is subject to a regeneration process, wherein said regeneration process comprises the introduction of inert gas and/or an oxidant and/or a reductive fluid. 
     
     
         6 . The process according to  claim 4 , wherein said high severity is in an outlet or inlet of said reactor, or intra-reactor, and further wherein said high severity is greater than 425° C.. 
     
     
         7 . The process according to  claim 6 , wherein said weakly-coordinating compound reduces the H—O bond frequency of the zeolite or aluminosilicate framework by about 1 to 300 cm −1  as measured by FT-IR. 
     
     
         8 . The process according to  claim 1 , wherein said olefins have a carbon chain length of C2 to C4. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . The process according to  claim 1 , further comprising the step of removing at least one by-product before introducing the first composition to at least one zeolitic catalyst. 
     
     
         12 . The process according to  claim 11 , wherein said at least one by-product is removed by adsorption, aqueous redox reaction, solvent or solid absorption, electrostatic precipitation, centrifugal separation, or filtration. 
     
     
         13 . (canceled) 
     
     
         14 . (canceled) 
     
     
         15 . The process according to  claim 1 , wherein said high-selectivity conversion of a first composition comprising olefins to a second composition comprising the monocyclic aromatic compounds is greater than 25. 
     
     
         16 . (canceled) 
     
     
         17 . The process of  claim 1 , further comprising: subjecting a feed gas to a compound removal process to yield the first composition, the compound removal process comprising:
 inputting the feed gas and a compound removal solution into a compound removal reactor; and   outputting from the reactor an output including the first composition.   
     
     
         18 . The process of  claim 17 , the compound removal solution including:
 circulating ammonium polysulfide (APS);   diammonium polysulfide;   ammonium hydroxide; or   a mixture thereof.   
     
     
         19 . (canceled) 
     
     
         20 . (canceled) 
     
     
         21 . The process of  claim 17 , the compound removal solution including a mixture of a first compound removal solution component and a second compound removal solution component in aqueous solution at a weight ratio of 1:2 at approximately 20-40° C., wherein the second compound removal solution component is an alkaline component. 
     
     
         22 . A process for supplying a first composition to a downstream catalytic process, comprising:
 inputting the feed gas and a compound removal solution into a compound removal contactor; and   operating the reactor to remove at least one by-product from the feed gas; and, outputting from the reactor an output composition to the downstream catalytic process, the output composition including at least one olefin.   
     
     
         23 . The process of  claim 22 , the compound removal solution including:
 circulating ammonium polysulfide (APS);   diammonium polysulfide;   ammonium hydroxide; or   a combination thereof.   
     
     
         24 . (canceled) 
     
     
         25 . (canceled) 
     
     
         26 . The process of  claim 22 , the compound removal solution including a mixture of a first compound removal solution component and a second compound removal solution component in aqueous solution at a weight ratio of 1:2 at approximately 20-40° C. 
     
     
         27 . The process of  claim 22 , further comprising:
 outputting from the compound removal contactor an additional output including a by-product removal output;   stripping at least one component of the by-product removal output in a vessel separate from the reactor.   
     
     
         28 . The process of  claim 27 , the by-product removal output including ammonium polysulfide (APS). 
     
     
         29 . The process of  claim 28 , the at least one component of the by-product removal output including gaseous ammonia and hydrogen sulfide. 
     
     
         30 . (canceled) 
     
     
         31 . (canceled) 
     
     
         32 . The process of  claim 27 , the at least one component including ammonium polysulfide (APS), the process further comprising circulating the APS to the compound removal contactor.